Our company was re-formed under a new name. Rather than rename the organization on the App Store, we were advised by support to create a new organization and then transfer the app to that organization, which we have done.
Our app implements Apple Authentication. We did not not migrate the users of the app (as instructed here: https://developer.apple.com/documentation/sign_in_with_apple/transferring_your_apps_and_users_to_another_team)
Is it possible to now migrate the users, after the app has been transferred? Our attempt to get an authorization token with scope "user.migration" results in HTTP error 400 with body: "invalid_client".